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SUMMARY:Frazil-ice dynamics in mixed layers and sub-ice-shelf plumes - Dav
 id Rees Jones (University of Oxford)
DTSTART:20170915T084000Z
DTEND:20170915T090000Z
UID:TALK79381@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:The growth of frazil ice is an important mode of ice formation
  in the cryosphere. We consider models of a population of ice crystals wit
 h different sizes to provide insight into the treatment of frazil ice in l
 arge-scale models. We apply our model to a simple mixed layer (such as at 
 the surface of the ocean) and to a buoyant plume under a floating ice shel
 f. We provide numerical calculations and scaling arguments to predict the 
 occurrence of frazil-ice explosions (periods of rapid ice growth). Faster 
 crystal growth rate\, higher secondary nucleation and slower gravitational
  removal make frazil-ice explosions more likely. We identify steady-state 
 crystal size distributions\, which are largely insensitive to crystal grow
 th rate but are affected by the relative importance of secondary nucleatio
 n to gravitational removal. Finally\, we show that the fate of plumes unde
 rneath ice shelves is dramatically affected by frazil-ice dynamics. Differ
 ences in the parameterization of crystal growth and nucleation give rise t
 o radically different predictions of basal accretion and plume dynamics\; 
 and can even impact whether a plume reaches the end of the ice shelf or in
 trudes at depth.<br><br>Further details can be found at&nbsp\;<a target="_
 blank" rel="nofollow" href="http://www.the-cryosphere-discuss.net/tc-2017-
 155/">www.the-cryosphere-discuss.net/tc-2017-155/</a>&nbsp\;(Rees Jones\, 
 D. W. and Wells\, A. J.).<br><br>
LOCATION:Seminar Room 1\, Newton Institute
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